package com.hbx.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.hbx.reggie.common.BaseContext;
import com.hbx.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的URL
        String requestURI = request.getRequestURI();

        //定义不需要处理的请求路径
        String[] urls = new String[]{
          "/employee/login",
          "/employee/logout",
          "/backend/**",
          "/front/**",
          "/common/**",
          "/user/sendMsg",//移动端发送短信
          "/user/login"//移动端登录
        };
        log.info("得到的请求：{}",request.getRequestURL());
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.如果不需要处理，则直接放行
        if(check){
            filterChain.doFilter(request,response);
            return;
        }

        //4-1.判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId); //将empId存入线程中

            filterChain.doFilter(request,response);
            return;
        }
        //4-2.判断移动端  登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId); //将userId存入线程中

            filterChain.doFilter(request,response);
            return;
        }


        //5.如果未登录则返回未登录状态
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

//        log.info("拦截到请求：{}",request.getRequestURL());
//        filterChain.doFilter(request,response);
    }

    /**
     *  路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURL
     * @return
     */
    public boolean check(String[] urls,String requestURL){
        for (String url : urls){
            boolean match = PATH_MATCHER.match(url, requestURL);
            if(match){
                log.info("放行的请求：{}",requestURL);
                return true;
            }
        }
        return false;
    }
}
